Probalistic models are presented for the still water bending moment (SWBM) and vertical wave bending moment (VWBM). Different stochastic and deterministic methods are applied for the combination of the long-term SWBM andVWBM. It is found that commonly applicable deterministic load combinationmethods, namely, the paek coincidence method, the Turkstras rule and the SRSS rule, are either very conservative or nonconservative. Using stochasitic methods, including the exact pointcrossing method, approximate load coincidence method and Ferry Borges method, leads to identical predictions for the current load combination problem. For code application, load combination factors are introduced for both sagging and hogging conditions to reduce the conservatism inherent in the existing ship rules. Case studies are performed for an offshore production ship. A considerable reduction of the total design bending moment is found when the load coincidence is properly considered instead of combining the maximum of each load.


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    Title :

    Stochastic and deterministic combinations of still water and wave bending moments in ships


    Additional title:

    Stochastische und deterministische Kombinationen von Biegemomenten in Schiffen bei Glattwasser und im Seegang


    Contributors:
    Wang, X. (author)

    Published in:

    Marine Structures ; 9 , 8 ; 787-810


    Publication date :

    1996


    Size :

    24 Seiten, 7 Bilder, 4 Tabellen, 29 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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